Transformer



Jain. 12, 1932. P. R. DIJKsTr-:RHUIS 1,841,016

TRANSFORMER Filed Jul'y 2, 1928 Patented Jan. 12, 1932 UNITED STATES PATENT or-FICE POPKO REINDER DIJKSTERHUIS, 0F EINDHOVEN, NETHERLANDS, ASSIGNOR TO N. V.

PHILIPS GLOEILAMPENFABRIEKEN, OF' EINDHOVEN, NETHERLANDS, A LIMITED LIABILITY COMPANY 0F THE NETHERLANDS TRANSFORMER Application filed July 2, 1928, Serial No. 289,775,k and in the Netherlands July 1, 1927.

This invention relates to a transformer the coils of which are wound on one or more cylindrical cases. Tt is generally known to connect the ends of the coils directly to rcontact wires which in this case are connected to the respectivo terminals of the transformer'.

According to the invention the case Wall has fixed to it Contact strips of Wires which protrude from each side of the case, one end of which is connected to a Winding Wire and the other to a terminal. This has the advantages that any pull exerted on the connection .wires is absorbed bythe case and that in addition the connection of the ends of the coils to the terminals is greatly simplified. According tothe invention, the operation of winding the coil on the case is started by bending back one of the contact AWires on the case and connecting it to the Winding Wire by bending over and flattening. Then the .vire is Wound and the end is iiXed to the contact strip which meanwhile has been bent back on the winding produced. If the secondary and the primary are arranged on each other it is necessary to secure four contact strips to the case. This case is illustrated in the accompanying drawings in which:

Fig. lis a perspective view of a case which has fixed to it four contact strips and Fig. 2 is a sectional View of the same case after both the primary and the secondary have been mounted on it.

Referring to Figure 1, the case l is preferably made of bakelized paper pertinax. The Wall of this case has introduced in it four Contact strips or Wires 2 Which are so fixed to it that they do not easily become detached on a pull being exerted on the ends of the strips or Wires. Figure 2 shows the manner of connecting one of the contact strips 2a to the beginning of the primary Whereas the other 2b contacts With the end of the latter. The connections of the two other strips to the secondary cannot be illustrated by reason of the nature of the sectional vieW. Atone of the free ends of the contact strip it is shown in What manner it is possible to connect it in practce to a termiserted between the bent-over end of the con tact strip and the latter can be secured eficaciously by clamping the bent-over end.

This in contradistinction to the usual method no soldering is Wanted.

Claim:

In a transformer having a primary and a seconda-ry, a spool having contact stri s attached thereto and extending beyon the ends of'the spool, one end of one of the said strips being bent over on the outer surface of the said spool, a coil Wound on said spool, the inner turn of the said coil being connected Vto said bent over end, the outer turn of said coil being attached to another strip having the attached end bent over on the coih and a second coil Wound over the vIirst coil and attached to additional ones of the said contact strips. f

In testimony whereof I have signed my name to this specification.

POPKO REINDER DIJKSTERHUIS. 

